Not sure of your layout as have a diesel. Can you trace any breather pipe of egr valve pipe that returns into the inlet pipe? Might be the egr stuck open, any dash lights on?
Not sure the timing would cause this issue, you have have a code reader so does it show egr data like mine
Not sure of your engine but my diesel is fly by wire throttle, is yours? I had it a P2015 when my throttle position sensor got stuck. It works on a little motor on the inlet manifold as just needed a clean and lite grease.
Sorry not more helpful
P2191 code definition System Too Lean at Higher Load Bank 1 What the P2191 code means P2191 is an OBD-II generic code for the engine control module (ECM) detecting that the fuel control has reached its rich limits when the engine...
Looking at this link might be worth putting in a good fuel injection cleaner, has all the servicing been done e.g fuel filter, spark plugs?
On my code reader you can also check fuel pressure which changes slightly when you press the clutch (clutch switch)
Glad you are getting somewhere, not sure if you can get injector cleaned or just replace. Still might be worth changing fuel filter and running a good injector cleaner through the system. Used in the past STP® SUPER CONCENTRATED FUEL INJECTOR CLEANER Update once your car is running fine.